To assign values to individual elements of M you can use the el() function hotkey "[". There are two ways to index the elements of M. You can use the serial method which assigns a single number to each element within M from 1 to n where n is the number of elements in M.

This is identicial to writing the following pseudo-code for i in 1..length(M){ M(i)=i }

You can create the previous assignment by typing "M[i:i=" without quotes.

The second method to assign values to individual elements is by selecting the rows and column of the element you wish to assign. For example to change the value "4" to "100" you would write the following.

You can create the previous assignment by typing "M[2,1:100=" without quotes. Here 2 represents the second row and 1 is the 1st column where the previous value of "4" was.